US3894181A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Differential enhancement of periodically variable images
Assignee: Wisconsin Alumni Research Foundation
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Filing: 1973-06-14
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Granted: 1975-07-08
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Expires: 1993-06-14
Abstract
Abstract Image signals are converted to video signals which are differentially detected, integrated, subtracted and displayed to display integrated differential features.
Inventors
- 👤 Charles A Mistretta
- 👤 Michael G Ort
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:14
CPC Classifications
G; G21; G21K; G21K4/00; H; H04; H04N; H04N5/00; H04N5/30; H04N5/32; H04N5/3205
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
205 words
Differential imaging apparatus, comprising image producing means for alternately producing first and second sequential image with identical portions and differential portions, means including a television system for converting said first and second images into first and second video signals, a video difference detector, means for sequentially supplying said first and second video signals corresponding to the first and second images to said video difference detector, said detector being operative to produce a first differential video signal corresponding to the difference between said first and second video signals, an image storage device, first writing means for writing an image in a positive sense on said image storage device corresponding to said first differential video signal, means for deriving a second differential video signal from said video difference detector corresponding to the difference between said second and first video signals, second writing means for writing a second image in a negative sense on said image storage device corresponding to said second differential video signal whereby said image storage device additively integrates the differential portions of said differential video signals while subtractively combining the non-differential portions thereof, reading means for reading the integrated image stored in said image storage device, and display means for displaying said integrated image.
Claim 2
Dependent Claim
205 words
Differential imaging apparatus, comprising image producing means for alternately producing first and second sequential image with identical portions and differential portions, means including a television system for converting said first and second images into first and second video signals, a video difference detector, means for sequentially supplying said first and second video signals corresponding to the first and second images to said video difference detector, said detector being operative to produce a first differential video signal corresponding to the difference between said first and second video signals, an image storage device, first writing means for writing an image in a positive sense on said image storage device corresponding to said first differential video signal, means for deriving a second differential video signal from said video difference detector corresponding to the difference between said second and first video signals, second writing means for writing a second image in a negative sense on said image storage device corresponding to said second differential video signal whereby said image storage device additively integrates the differential portions of said differential video signals while subtractively combining the non-differential portions thereof, reading means for reading the integrated image stored in said image storage device, and display means for displaying said integrated image.
Claim 3
Dependent Claim
33 words
Apparatus according to claim 1, in which said image producing means includes X-ray apparatus for aLternately producing first and second X-ray images under significantly different conditions whereby said images will have differential portions.
Claim 4
Dependent Claim
35 words
Apparatus according to claim 1, in which said image producing means comprises X-ray apparatus for alternately producing first and second X-ray images with X-rays having significantly different energies whereby said images will have differential portions.
Claim 5
Dependent Claim
52 words
Apparatus according to claim 1, in which said image-producing means comprises X-ray apparatus for alternately producing first and second X-ray images using X-rays of different energies, said X-ray apparatus including an X-ray source and differential X-ray filtration means for alternately filtering the X-rays from the source for producing the different X-ray energies.
Claim 6
Dependent Claim
47 words
Apparatus according to claim 1, in which said image-producing means comprises X-ray apparatus for alternately producing X-ray images using X-rays having different energies, said X-ray apparatus including an X-ray source and means for alternately energizing said X-ray source with two different voltages to produce the different energies.
Claim 7
Dependent Claim
18 words
Apparatus according to claim 1, in which said video difference detector includes a video subtraction cathode ray tube.
Claim 8
Dependent Claim
22 words
Apparatus according to claim 6, in which said cathode ray tube includes a target having a dielectric layer over a conductive backplate.
Claim 9
Dependent Claim
33 words
Apparatus according to claim 7, in which said cathode ray tube comprises means for causing an electron beam to scan said dielectric layer to produce an electrical charge image on said dielectric layer.
Claim 10
Dependent Claim
17 words
Apparatus according to claim 8, including output means coupled to the backplate of said cathode ray tube.
Claim 11
Dependent Claim
23 words
Apparatus according to claim 1, in which said image storage device comprises a storage tube having a target for storing electrical charge images.
Claim 12
Dependent Claim
34 words
Apparatus according to claim 10, in which said storage tube comprises a target having a mosaic of dielectric islands over a conductive backplate, and means for causing an electron beam to scan said target.
Claim 13
Dependent Claim
65 words
Apparatus according to claim 11, in which said first writing means includes means for energizing said backplate with a first voltage which is sufficiently high to produce writing with positive charges on said target by the electron beam, said second writing means including means for energizing said backplate with a lower voltage such that the electron beam produces writing with negative charges on said target.
Claim 14
Dependent Claim
29 words
Apparatus according to claim 12, in which said reading means includes means for energizing said backplate with a low voltage while deriving a video signal output from said backplate.
Claim 15
Dependent Claim
30 words
Apparatus according to claim 12, including means for alternately actuating said first and second writing means through a plurality of cycles to produce enhanced integrations of the differential signal portions.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-07 | 1979-01-06 | 1979-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-07 | 1983-01-06 | 1983-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-07 | 1987-01-06 | 1987-07-08 | $7700.00 | Window Closed / Lapsed |